Numerical investigation of combustion and intake valve timing on the performance of TU5 spark ignition engine

Authors

1 Technical and Engineering Faculty, Eqbal Lahoori Institute of Higher Education, Mashhad, Iran

2 Department of Mechanical Engineering, National University of Skills ( NUS ), Tehran, Iran

3 Department of Mechanical Engineering, National University of Skills (NUS), Tehran, Iran

10.22044/jsfm.2025.15181.3901

Abstract

Spark and intake valve timings are key operating parameters of spark ignition engines that determine the initial combustion process and the intake air amount during engine operation. Therefore, determining the appropriate timing for spark initiation and breathing are important factors for improving engine performance and complete combustion. The present work aims to evaluate the effects of spark and intake valve timings and the appropriate selection of compression ratio at different speeds on the TU5 engine performance using a numerical method. To achieve this goal, first, numerical simulation results are compared with experimental results and validated, then the effects of engine technical parameters, including compression ratio, combustion and intake valve timings at different speeds on characteristics of power, torque, average combustion pressure, volumetric efficiency, thermal efficiency, and specific fuel consumption are investigated. The results showed that engine output characteristics at 4000 rpm have the best performance. Also, the optimal advance for maximizing power and torque and the lowest specific fuel consumption is 5 and 10 degrees before the top dead center at 2000 and 4000 rpm, respectively. In addition, by selecting the intake valve advance angle at about 30 degrees before the intake process, volumetric efficiency will reach about 97 percent.

Keywords

Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 6
May and June 2025
Pages 19-32

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